LASCO FeXIV and FeX observations of the solar coronal rotation during the recent solar activity minimum

Details LASCO FeXIV and FeX observations of the solar coronal rotation during the recent solar activity minimum LASCO FeXIV and FeX observations of the solar coronal rotation during the recent solar activity minimum

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..471..297i&link_type=abstract

The solar wind nine conference. AIP Conference Proceedings, Volume 471, pp. 297-300 (1999).

Physics

Solar Physics, Visible

Scientific paper

We investigate the periodicity and recurrence of FeXIV and FeX emission structures with heliospheric latitude and distance above the Sun's surface. The data was observed by the LASCO C1 coronagraph on board the SOHO spacecraft during the solar minimum activity from April 1996 to March 1997. For the green FeXIV emission line, reliable estimates of the solar rotation period could be obtained between -60 and 60 degrees in latitude and between 1.1 and 2 solar radii. Our investigation confirms the results of (3) of an almost ridgidly rotating equatorial streamer belt with a rotation period of about 27.5+/-0.5 days. Even coronal emissivity structures with a shorter life time between 14 and 27 days do not seem to rotate differentially. The FeX observations on the other hand do yield some indication of a reduced rotation for coronal structures over the solar poles. However, the error of the derived rotation period estimates is considerable so that the analysis of the FeX data does not allow a definite conclusion.

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